sub length_in_grapheme_clusters {
    my $length;
    $length++ while $_[0] =~ m/\X/g;
    return $length;
}

[download]

As previously mentioned, this can be written as: 

sub length_in_grapheme_clusters {
    my $length = () = $_[0] =~ /\X/g;
    return $length;
}

[download]
or 
sub length_in_grapheme_clusters {
    return 0+( () = $_[0] =~ /\X/g );
}

[download]

You must roll your own.

As previously mentioned, he does not need to roll his own as there's already an existing solution. (It was also mentioned that length_in_grapheme_clusters is not sufficient.)

Update: Fixed length_in_grapheme_clusters so it can be called in list context.

In reply to Re^2: Trying to determine the output length of a Unicode string by ikegami
in thread Trying to determine the output length of a Unicode string by pierswalter

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